Abstract
The microstructural evolution and phase transformation of cast Al–1.5Mg–0.6Si–3Li (mass %) alloy during homogenization were investigated. The results show that severe dendritic segregation exists in the as-cast ingot. Mg and Si elements segregate at grain boundaries to form intermetallic Mg2Si phase. In addition, there also exists Li-containing phases, including T-Al2LiMg and δ-AlLi phase in the α-Al matrix. These Li-containing phases completely dissolve into the matrix and the segregation of dendrite is eliminated after homogenization at 570 °C for 24 h. During the homogenization, most of the Mg2Si phase at grain boundaries disappear, but AlLiSi ternary compounds precipitate and disperse at interior and boundary of grains because of the strong binding capacity between Li and Si element. The AlLiSi phase is detrimental to the properties of the alloy, therefore homogenization treatment may be not profitable for microstructural refinement of Al–1.5Mg–0.6Si–3Li alloy.
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References
T. Dursun, C. Soutis, Recent developments in advanced aircraft aluminium alloys. Mater. Des. 56, 862–871 (2014)
A. Abd El-Aty, Y. Xu, X. Guo et al., Strengthening mechanisms, deformation behavior, and anisotropic mechanical properties of Al-Li alloys: a review. J. Adv. Res. 10, 49–67 (2018)
R.J. Rioja, J. Liu, The evolution of Al-Li base products for aerospace and space applications. Metall. Mater. Trans. A 43, 3325–3337 (2012)
E.J. Lavernia, T.S. Srivatsan, F.A. Mohamed, Strength, deformation, fracture behaviour and ductility of aluminium-lithium alloys. J. Mater. Sci. 25(2), 1137–1158 (1990)
S.Y. Betsofen, V.V. Antipov, M.I. Knyazev, Al-Cu-Li and Al-Mg-Li alloys: phase composition, texture, and anisotropy of mechanical properties. Russ. Metall. (Met.) 4, 326–341 (2016)
C. Giummarra, B. Thomas, R.J. Rioja, in New Aluminum Lithium Alloys for Aerospace Applications. Proceedings of the Light Metals Technology Conference 2007, Quebec, Canada (2007)
N.E. Prasad, A.A. Gokhale, R.J. Wanhill, Aluminium-Lithium Alloys Processing, Properties, and Applications (Elsevier, UK, 2014)
W.S. Miller, L. Zhuang, J. Bottema et al., Recent development in aluminium alloys for the automotive industry. Mater. Sci. Eng. A 280(1), 37–49 (2000)
O. Engler, J. Hirsch, Texture control by thermomechanical processing of AA6xxx Al-Mg-Si sheet alloys for automotive applications—a review. Mater. Sci. Eng. A 336(1–2), 249–262 (2002)
J.C. Williams, E.A. Starke, Progress in structural materials for aerospace systems. Acta Mater. 51(19), 5775–5799 (2003)
S. Ud Din, J. Kamran, N.H. Tariq et al., The synergistic effect of Li addition on microstructure, texture and mechanical properties of extruded Al-Mg-Si alloys. Mater. Chem. Phys. 174, 11–22 (2016)
S. Ud Din, B.A. Hasan, N.U.H. Tariq et al., Effect of Li addition on microstructure and mechanical properties of Al-Mg-Si alloy. Int. J. Mater. Res. 8(105), 770–777 (2014)
R. Chen, Z. Huang, C.Q. Chen et al., Thermodynamic calculated and TEM observed microstructure of Al-Li-Mg-Si alloys. Mater. Sci. Eng. A 280(1), 146–150 (2000)
R. Chen, C.Q. Chen, Z. Huang et al., The precipitation and mechanical properties of Al-Li-Mg-Si alloys. Mater. Sci. Forum 331–337, 1375–1380 (2000)
J.A. Österreicher, M. Kumar, A. Schiffl et al., Secondary precipitation during homogenization of Al-Mg-Si alloys: influence on high temperature flow stress. Mater. Sci. Eng. A 687, 175–180 (2017)
J.M. Silcock, The structural ageing characteristics of Al-Cu-Li alloys. J. Jpn. Inst. Met. 88, 357–364 (1960)
Z.W. Huang, R.E. Smallman, M.H. Loretto et al., Influence of lithium additions on precipitation and hardening of 6061. Mater. Sci. Technol. 7, 205–212 (1991)
Z.W. Huang, M.H. Loretto, R.E. Smallman et al., Mechanism of nucleation and precipitation in 6061-Li alloys. Mater. Sci. Technol. 10, 869–878 (1994)
L. Zhang, Z. Zheng, J. Li et al., Microstructural evolution and mechanical properties of a new Al-Cu-Li-X alloy at different solution temperatures. Rare Met. (2016)
A.K. Niessen, F.R. De Boer, R. Boom et al., Model predictions for the enthalpy of formation of transition metal alloys II. Calphad 7(1), 51–70 (1983)
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This study was supported by The National Key Research and Development Program of China (No. 2016YFB0300802).
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Yang, X. et al. (2019). Microstructural Evolution and Phase Transformation of Al–Mg–Si Alloy Containing 3% Li During Homogenization. In: Han, Y. (eds) Physics and Engineering of Metallic Materials. CMC 2018. Springer Proceedings in Physics, vol 217. Springer, Singapore. https://doi.org/10.1007/978-981-13-5944-6_3
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DOI: https://doi.org/10.1007/978-981-13-5944-6_3
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